Connected: An Internet Encyclopedia
RFC 1123 - 3.2.6 Telnet Command Structure: RFC-854, p. 13

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### 3.2.6 Telnet Command Structure: RFC-854, p. 13

Since options may appear at any point in the data stream, a Telnet escape character (known as IAC, with the value 255) to be sent as data MUST be doubled.

Next: 3.2.7 Telnet Binary Option: RFC-856

Connected: An Internet Encyclopedia
RFC 1123 - 3.2.6 Telnet Command Structure: RFC-854, p. 13